fluid aspect

 fluid dynamics Essay

Fluid Characteristics

– Viscosity

Dave Promote

Department of Chemical Anatomist

University of Rochester

Email: [email protected] rochester. edu

one particular

Chemical Engineering

What do Substance Engineers Perform?

Manufacturing

Study

Biotech

Chemical

Pharmaceutical

Medical

2

FINE, first just a little background

Fluid Mechanics is a study of fluids possibly in

movement (Fluid Dynamics) or at rest (Fluid Statics)

Fluids will be either gas or the liquid

Solids aren't fluids

Houses of the fluid are things like density,

pressure, temperature, and VISCOSITY!

several

Fluid – a description

A material that deforms continuously underneath

the actions of shear stress

Gas or Liquid

Solids may resist a shear tension, a fluid can't

5

Applications of Fluid Mechanics

Talks about blood flow in capillaries of some

microns in diameter to crude oil flow

through an 800 mile lengthy, 4 feet diameter pipe

Explains why airplanes happen to be streamlined

with smooth areas

Explains for what reason golf balls are made will

dimpled surfaces for many efficient travel around

5

Drag (Pounds of Force)

A result of Dimples in Golf Balls

zero. 5

zero. 45

zero. 4

0. 35

0. 3

0. 25

zero. 2

zero. 15

zero. 1

zero. 05

0

Drag for Sphere

Move for Golf Ball

0

75

200

300

400

Velocity (Feet per Second)

6

A List of Some Applications

Finish

Breathing

Blood flow/pipe circulation

Swimming

Pumping systems (traditional and

your heart)

Fans

Turbines

Airplanes & Rockets

Missiles

Ships

Renal dialysis devices

Heart-Lung avoid

machines

Membrane oxygenators

Machines

And lots even more!

7

For everything " FLUID” Movement is key

How fast

What direction

Just how changing as time passes (differential

equations)

Flow properties deal with items like the

velocity, changes in temp,

concentration.

almost eight

Isaac Newton

Key participant in most of basic scientific research

Three " Laws”

A body will stay at rest or perhaps in action

1 .

unless of course acted upon simply by an external power

ΣF=ma

installment payments on your

For every action there is an equal and

three or more.

opposite reaction

9

Newton's Law of Viscosity:

dv

τ =µ

dy

Shear stress

viscosity

Shear Strain

10

Viscosity – The gender chart?

A property of any fluid to resist the rate of

deformation – a quantitative way of measuring a fluid's

resistance to stream (water vs . syrup)

Takes place when a fluid is put to work by a shear

stress

Simply stated, it's just how " thick” a liquid is

We easily move through air

It can more difficult to move through water which

is 50X larger in viscosity than surroundings

11

A couple of common illustrations:

Most Viscous

Air < Water < Paint < Pancake Viscous, thick treacle < Teeth Paste

Least Viscous

12

Units

(yep – units, very important)

If we discuss how deep a

children's pool is and I tell you

it's far " 10”, would you dive in?

Not whether it's 10 inches wide

But you may if it was 10 foot

Units are key in all science, under no circumstances

accept quite a few without a unit if it's

designed to have one

13

Units of Viscosity

Stability (the most usual units utilized to

describe viscosity, but not the only one)

Given its name the French physician –

Blue jean Louis Poiseuille (1799 - 1869)

One-hundredth of a Gesse is a centipoise or

" cP”

13

Viscosity of Some " Common” Components

(all are in devices of Centi-Poise)

Hydrogen

Carbon

Air

Blood

Gasoline

Water

Mercury

Corn Oil

HIGHLY RESISTANT TO WEATHER CHANGES 30 olive oil

Heinz Ketchup

0. 0088

0. 015

0. 018

0. forty five

0. 29

1 . 0

1 . five

72

290

50, 1000

15

Changing a Material's Viscosity

Simplest ways:

Change the Temperature – Heat it Up!

Strong Impact

Change the Pressure – much less easy…

Weakened Effect: Lower pressure, viscosity

decreases

16

In a best world:

Liquids obey Newton's Law of Viscosity

dv

τ =µ

dy

Directly line completing

through the source

τ

Incline = viscosity

(Format: con = m x + b)

dv/dy

17

Newtonian Fluids

Essential fluids that obey Newton's Regulation of Viscosity

Linear romantic relationship between shear stress and

shear stress

Some Examples of Newtonian Liquids:

Water

Basic Alcohols

Basic Organic Solvents

18

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